Getting Fuel from Carbon Dioxide?

[Ophiolite]

not 100% sure of the EXACT details but on the Ocean floor in some place or another, there is Methane leaking out, but due to the extreme pressure and low temp, it "fuses" with the water to make a solid .........It did have a name, but it was a long time ago.

Clathrate. A google search should reveal enough links to provide a couple of years reading. Very interesting substance that may have huge implications for climate change.